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An emerging area within biological control is the role of N-acyl-homoserine lactones (N-acyl-HSL's) in the regulation of competitive fitness and pathogen suppression. N-acyl-HSL regulatory systems utilize two conserved proteins which belong to the LuxR/LuxI regulatory family: one is a transcriptional regulator and the second produces the N-acyl-HSL signal. These signals regulate the expression of a diverse range of bacterial traits involved in microbe-microbe and host-microbe interactions. Several fluorescent pseudomonads important in biological control produce N-acyl-HSL signals which regulate genes that encode products involved in pathogen suppression. In contrast to pathogenic bacteria, little is known regarding N-acyl-HSL-mediated gene regulation in biological control bacteria. This minireview will focus on the current status of the role of N-acyl-HSL's in the regulation of phenazine antibiotic and …